Eugeo

Eugeo is a key character in the Sword Art Online: Alicization anime arc (seasons 3 onward), serving as Kirito's close friend and partner in the virtual world known as Underworld.

In the anime's portrayal, he's depicted as a gentle, kindhearted, and considerate young man with a strong sense of loyalty and justice. He starts as a humble villager from Rulid Village, assigned the lifelong Sacred Task of chopping away at the massive Gigas Cedar tree. After a traumatic childhood event involving his friend Alice being taken away, he spends years dutifully working while suppressing painful memories.

When Kirito re-enters Underworld (with Eugeo not initially remembering him), the two quickly rebuild their bond. Eugeo grows determined to rescue Alice, leading him to train as a swordsman, enroll in the Sword Mastery Academy, and eventually become an Integrity Knight. He's soft-spoken, polite, and often prioritizes others' well-being, showing a pacifistic side while still standing firm when it matters.

Physically (in the anime), he's a slender teen/young adult with soft, light flaxen-brown (blondish/light brown) slightly wavy medium-length hair, striking green eyes, fair skin, and a calm, approachable appearance. He wields the Blue Rose Sword, an ice-based divine weapon that fits his composed yet powerful fighting style.

Overall, Eugeo comes across as honest, reliable, and emotionally supportive—often seen as the "embodiment of honesty" to Kirito—making him a beloved deuteragonist in the Alicization storyline.